Question

Action Comic #1, which originally sells for 10 cents, now sells for $18,500. This comic has increased in value
A. 18,500,000%
B. 185,000%
C. 1,849,990%
D. 18,499,900%

Is B correct?

Answer 1

(now / then) * 100%

Answer 2

(18500-0.10)/0.10 * 100